[Jemmy (JemmyIndex)]

Fixes #65339.

The current ECMAScript draft defines Atomics.pause() with no arguments, but the bundled declaration still accepts an optional number. Remove the obsolete parameter so Atomics.pause(1) reports TS2554 while Atomics.pause() continues to compile. TC39's rationale explains why the parameter was removed.

The existing esnextSharedMemory conformance case already exercises both calls. Update its type baseline and add the expected diagnostic baseline; no new test case is needed.

Validation:

• The existing conformance case passes before the change with no diagnostics. After the declaration change, it produces TS2554 for the call with an argument. It passes again with the updated baselines.
• The CLI repro passes for Atomics.pause() and reports TS2554 for Atomics.pause(1.5).
• validate --all completed: build, compiler/conformance, parser, fourslash, CLI, extension, native/WASM API, lint and formatting checks passed. Its overall exit status is unsuccessful because TestSubscribeSymlinkCreate/windows and TestSubscribeSymlinkDelete/windows cannot create symlinks on this machine (A required privilege is not held by the client). Both were reproduced independently.
• hereby tidy passed without dependency changes.

AI assistance: This patch and its validation were prepared with Codex.

[Copilot]

🟢 Approval recommended

No active review issues were identified for the change aligning Atomics.pause with the draft’s zero-argument signature.

No open issues 🎉

What changed in this PR

Updates TypeScript’s bundled Atomics.pause declaration to match the ECMAScript draft’s zero-argument signature, addressing #65339.

Changes:

• Removes the obsolete optional numeric parameter.
• Updates the existing conformance baselines to preserve Atomics.pause() support and expect TS2554 for Atomics.pause(1).

File	Description
tsc/​testdata/​baselines/​reference/​conformance/​esnextSharedMemory.types	Updates expected types to the zero-argument signature.
tsc/​testdata/​baselines/​reference/​conformance/​esnextSharedMemory.errors.txt	Adds the expected TS2554 diagnostic for an argument.
tsc/​internal/​bundled/​libs/​lib.esnext.sharedmemory.d.ts	Changes the declaration to pause(): void.

_{Review effort: Balanced}